66621333 has 16 divisors (see below), whose sum is σ = 91539776. Its totient is φ = 43079040.

The previous prime is 66621329. The next prime is 66621341. The reversal of 66621333 is 33312666.

It is not a de Polignac number, because 66621333 - 2² = 66621329 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66621333.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66621343) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10866 + ... + 15852.

It is an arithmetic number, because the mean of its divisors is an integer number (5721236).

Almost surely, 2^66621333 is an apocalyptic number.

It is an amenable number.

66621333 is a deficient number, since it is larger than the sum of its proper divisors (24918443).

66621333 is a wasteful number, since it uses less digits than its factorization.

66621333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5124.

The product of its digits is 11664, while the sum is 30.

The square root of 66621333 is about 8162.1892283872. The cubic root of 66621333 is about 405.3882026914.

Adding to 66621333 its reverse (33312666), we get a palindrome (99933999).

The spelling of 66621333 in words is "sixty-six million, six hundred twenty-one thousand, three hundred thirty-three".